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STOCK-BASED AWARD PLANS - Performance Share Narratives (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (years) 3 years    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (years) 3 years    
Shares authorized, shares | shares 8    
Granted | $ / shares $ 17.90 $ 15.50 $ 16.30
Fair value of shares vested | $ $ 6,000,000 $ 0 $ 0
Minimum [Member] | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target Unit Award 0    
Maximum [Member] | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target Unit Award 2